Electric Circuits
Two resistors R1 and R2 give combined resistance of 4.5 Ohm when connected in series and 1 Ohm when in parallel, the resistances are

 1.5 Ohm and 3 Ohm.
 1.25 Ohm and 3.25 Ohm.
 2.2 Ohm and 2.3 Ohm.
 2 Ohm and 2.5 Ohm.

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Electric Circuits
The voltage induced in an inductor is represented as,

 ratio of its inductance to current through it.
 product of its inductance and rate of change of current through it.
 ratio of current through it to its inductance.
 product of its inductance and current through it.

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